U.S. patent number 3,759,050 [Application Number 05/229,015] was granted by the patent office on 1973-09-18 for method of cooling a gas and removing moisture therefrom.
This patent grant is currently assigned to Modine Manufacturing Company. Invention is credited to Jack C. Dudley, Raymond S. Slaasted.
United States Patent |
3,759,050 |
Slaasted , et al. |
September 18, 1973 |
METHOD OF COOLING A GAS AND REMOVING MOISTURE THEREFROM
Abstract
The method of chilling a gas that contains moisture and
simultaneously condensing and removing the moisture to prevent the
condensate being blown in substantial amounts with the chilled gas
in which the moisture containing gas is blown sideways across
upright solid surfaces that are chilled to a temperature less than
the dew point of the gas to form condensate on the surfaces,
intercepting the condensate and directing it in paths of low
surface tension along the surfaces and out of the gas stream.
Inventors: |
Slaasted; Raymond S. (Racine,
WI), Dudley; Jack C. (Racine, WI) |
Assignee: |
Modine Manufacturing Company
(Racine, WI)
|
Family
ID: |
22859493 |
Appl.
No.: |
05/229,015 |
Filed: |
February 24, 1972 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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807492 |
Mar 17, 1969 |
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Current U.S.
Class: |
62/93; 62/285;
62/290; 165/111; 165/151; 165/181 |
Current CPC
Class: |
F28F
17/005 (20130101); F25B 39/02 (20130101); F25D
21/14 (20130101); F25D 2317/0683 (20130101) |
Current International
Class: |
F28F
17/00 (20060101); F25D 21/14 (20060101); F25B
39/02 (20060101); F25d 021/14 () |
Field of
Search: |
;165/110,111,181
;62/93,285,288,289,290 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Davis, Jr.; Albert W.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
This application is a continuation of our copending application
Ser. No. 807,492, filed Mar. 17, 1969, now abandoned.
Claims
We claim:
1. The method of chilling a gas that contains moisture and
simultaneously condensing and removing moisture therefrom,
comprising: chilling spaced, upright, solid surfaces to a
temperature less than the dew point of said gas; blowing a main
stream of said gas sideways across and between said upright
surfaces from an entering side to a leaving side of said surfaces
for simultaneously chilling said gas and condensing moisture to a
liquid condensate on said surfaces, the stream of gas forcing
liquid condensate with it sideways along the surfaces; intercepting
said condensate on said surfaces during said forcing by a plurality
of adjacent intercepting members integral with said surfaces
located between said entering and leaving sides of each said
surface to prevent blowing substantial amounts of condensate beyond
said surfaces; and directing the intercepted condensate along said
plurality of intercepting members on each of said surfaces away
from said solid surfaces and out of said main stream along paths of
low surface tension thereby resulting in the rapid removal of said
condensate from said main stream.
2. The method of claim 1 wherein said intercepting members have
upright edges spaced from the respective side surfaces to provide
said paths of low surface tension.
Description
BACKGROUND OF THE INVENTION
The chilling of gas such as air containing substantial amounts of
moisture such as water vapor to condense the moisture therefrom is
widely practiced especially in summertime air conditioning.
Customarily the air is blown through chilled surfaces such as the
surfaces of tube and fin heat exchangers to cool the air and
condense the moisture. The resulting condensate which collects on
the solid surfaces tends to be blown along with the air and
particularly where the moisture content is high condensate is
frequently blown from the surfaces to the exterior so that the
downstream areas of the flowing air become wet. The method of this
invention prevents this as the condensed moisture is intercepted
before it can get beyond the surfaces on the downstream side and is
directed in paths of relatively low surface tension away from the
main air stream.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a semi-diagrammatic elevation, partially in section, of
an air cooling system embodying the invention.
FIG. 2 is a vertical sectional view through the heat exchanger
matrix of the system of FIG. 1 taken substantially along line 2--2
of FIG. 3.
FIG. 3 is a fragmentary vertical sectional view through the matrix
and taken substantially along line 3--3 of FIG. 2.
FIG. 4 is a detail sectional view through a portion of the fin
structure and taken substantially along line 4--4 of FIG. 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
A system for practicing the method of the invention is disclosed in
the drawings of which FIG. 1 shows semidiagrammatically a system
comprising a housing 10 formed as a conduit in one end of which is
positioned an ordinary air blower 11 which exits into a chamber 12
that forms a part of the housing 10. Located within the chamber 12
is a heat exchanger matrix 13 that comprises back and forth passes
of a refrigerant conduit defining a plurality of spaced heat
conducting cooling tubes 14 that are generally horizontal and
connected by end tubular bends 15 in the customary manner.
The matrix 13 also comprises a plurality of upright spaced heat
conducting fins 16 that are arranged edgewise to the direction of
the stream of moisture containing gas, here shown as air, indicated
by the air flow arrows 17. The tubes 14 including the tubular bends
15 and the fins 16 are of heat conducting material such as metal
and particularly aluminum or copper.
The matrix 13 includes liquid drain means 18 here shown as spaced
louvers on the fins immediately above the tubes for providing
liquid flow paths of liquid condensate along the fins onto the
tubes 14 and from there down between the tubes. The specifically
embodied louvers 18 are formed integrally with the fins 16 as
indicated in FIG. 4 and extend above the tubes 14 for gravity flow
of liquid condensate along these louvers onto the tubes that are
beneath them.
Each of the tubes 14 is of flat transverse cross section as shown
in FIG. 3 with a major axis which is here shown as horizontal and a
minor axis at right angles thereto to provide an edge 19 facing the
incoming fluid or air stream 17.
In the preferred structure as shown in the drawings the louvers 18
are provided in sets 27 of a plurality of spaced louvers 18 with
each set being located above the broad upper surface of a tube as
indicated in FIG. 3. Each tube 14 is of generally oval transverse
cross section arranged with the edge facing the incoming fluid
stream 17 and the tubes are arranged in adjacent but horizontally
spaced vertical rows.
In the embodiment illustrated, the tubes 14 of the matrix are
supplied with liquid refrigerant 20 from a conduit system 34 in the
customary manner through a header pipe 21. In the tubes 14 this
refrigerant vaporizes or boils taking up heat so as to cool the
tubes 14 and fins 16. The refrigerant then exits through an exit
header 22 and into the system 34. Flow of liquid refrigerant is
controlled by a customary valve 23.
The heat exchanger of this invention provides high heat transfer
capability for cooling a moisture containing gas such as air with
means for removing condensate rapidly from the air flow paths
through the matrix so that the performance of the heat exchanger
approaches that achieved with a dry gas where condensate is no
problem. This is accomplished by providing tubes for the cooling
medium such as the refrigerant of low resistance to air flow
through the matrix such as by the oval-shaped construction
illustrated with the thin edge of each tube facing the incoming air
stream. With this, air flow is rapid through the matrix and heat
transfer from the tubes to the air is efficient. In addition to
this shape of the tubes heat transfer is also improved by providing
spaced fins interconnecting the plurality of tubes and through and
across which the air flows.
Further, in order to remove condensate from the air flow paths so
that air flow will not be blocked and so that the condensate will
not be blown from the matrix louvers are provided in the fins in
sets above each tube. As can be seen in FIG. 4 the louvers 18
project from the fin 16 into the air flow space between the fins.
With this arrangement the condensate from the air collects on the
louvers and the louvers intercept condensate pushed across the fins
by the air. The louvers also direct the condensate rapidly by
gravity flow onto the upper surfaces of the tubes where it is out
of the main air stream. The condensate then flows from each tube
principally down the fins to a lower tube and into the bottom of
the chamber 12 where the condensate collecting trough 24 is
located. Any condensate that is blown from a tube will be
intercepted by a next set 27 of louvers 18 so that substantially no
condensate is blown from the matrix 13.
Thus the vertical louvers 18 not only intercept the condensate
blown sideways by the air stream which in the embodiment of FIG. 3
enters from the right and exits from the left but also provides
vertical edges 29 as shown in greater detail in FIG. 4 down which
the condensate flows out of the principal air stream which as
stated in the illustrated embodiment is from right to left. Because
the condensate can flow downwardly along the vertical louvers 18
and can be concentrated at the downstream edges 29 these louvers
provide paths of low surface tension for the draining liquid and
thereby result in the rapid removal of the condensate downwardly
from the sideways flowing principal air stream. Flow of the
condensate along these louvers is of course by gravity.
The upright fins 16 provide solid surfaces that are chilled by the
evaporation of refrigerant in the matrix 13 to a temperature less
than the dew point of the entering gas as indicated by the arrows
17 in FIG. 1. This gas which in the illustrated embodiment is air
is therefore blown sideways across and between the fin surfaces
from an entering side which is the side adjacent the blower 11 and
indicated by the legend "Warm Air In" in FIG. 3 to a leaving side
which is indicated in FIG. 3 by the legend "Cool Air Out" and shown
by the arrows 32 in FIG. 1. This simultaneously chills the gas and
condenses moisture to a liquid condensate on the fin surfaces and
the stream of gas forces this condensate sideways along the
surfaces. The condensate is intercepted in its flow across the
surfaces from right to left as shown in FIG. 3 by intercepting
members embodied in the vertical louvers 27 located between the
entering and leaving sides of each surface to prevent blowing
substantial amounts of condensate beyond the fin surfaces. This
condensate intercepted by the louvers 18 is directed along the
intercepting members or louvers 18 away from the fin surfaces and
out of the main stream as indicated by the flow arrows at the drain
pipe in FIG. 1. The louver intercepting members 18 are integral
with the fin 16 surfaces and have upright edges as shown at 29 in
FIG. 4 spaced from their respective surfaces 16 to provide the
paths of low surface tension.
In operation liquid refrigerant from the condenser 30 which is
supplied with compressed gaseous refrigerant from the compressor 31
is fed through the valve 23 into the pipe 21 and from these through
the tubes 14 of the matrix 13. In flowing through the tubes 14 and
into the exit header 22 the refrigerant evaporates and cools the
air forced through the matrix 13 as indicated by the arrows 17. In
passing through the matrix 13 the air 17 is cooled rapidly and
efficiently.
Any moisture condensing within the matrix 13 tends to gather on the
fins 16 and to be blown along the fins by the air stream 17.
However, the louvers 18 which are arranged in sets 27 above the
upper surfaces 33 of the tubes 14 intercept the flowing condensate
and direct it by gravity flow onto the upper surfaces 33 of the
tubes and thereby out of the main portion of the air stream. Thus
the surface tension forces of the condensate cooperating with the
vertical louvers 18 substantially prevent horizontal travel of the
condensate. Once the condensate is on the surface of the tubes 14
air flow causes the condensate to travel along the surfaces of the
tubes until reaching the space between the vertical rows of tubes.
The condensate then drops downwardly between the tubes and
primarily along the surface of the fins 16 to the bottom collecting
trough 24. If, however, some of the condensate should travel
angularly downwardly to the next row of tubes this condensate will
impinge on the succeeding series of louvers and will be guided
downwardly in the same manner.
* * * * *